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3Com Dual 56K User Manual

3Com Dual 56K User Manual

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Dual 56K LAN Modem
User Guide
MODEL NO.
3C888
Part No. 1.018.1752
Published May 2000
http://www.3com.com/
http://www.3com.com/

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  • Page 1 Dual 56K LAN Modem User Guide MODEL NO. 3C888 Part No. 1.018.1752 Published May 2000 http://www.3com.com/ http://www.3com.com/...
  • Page 2 95052-8145 3Com Corporation reserves the right to revise this documentation and to make changes in content from time to time without obligation on the part of 3Com Corporation to provide notification of such revision or change. 3Com Corporation provides this documentation without warranty of any kind, either implied or expressed, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose.

  • Page 3: Safety Information

    There are no user-replaceable fuses or user-serviceable parts inside the unit. If there is a physical problem with the unit that cannot be solved with problem solving actions in this guide, contact the 3Com reseller from whom the equipment was purchased. If the units are stackable, only stack similar units.

  • Page 4: Important Notice De Securite

    Sollte ein physikalischer Fehler auftreten, der mit den in diesem Handbuch beschriebenen Maßnahmen nicht zu beheben ist, setzen Sie sich mit dem 3Com-Vertreter in Verbindung, bei dem Sie das Gerät erworben haben. Bei stapelfähiger Konstruktion nur gleichartige Einheiten verwenden.

  • Page 5: Informazioni Importanti Per La Sicurezza

    If any of the following conditions occur, isolate the electricity supply and refer to your 3Com reseller.
  • Page 6 Do not spill food or liquids on the unit. If the unit gets wet, isolate the electrical supply and contact your 3Com reseller. Do not push any objects into the openings of the unit. Doing so can cause fire or electric shock by shorting out internal components.

  • Page 7: Table Of Contents

    ABLE OF ONTENTS MPORTANT AFETY NFORMATION Wichtige Sicherheits-Informationen Important Notice de Securite Medidas de Seguridad Importantes Informazioni Importanti per la Sicurezza Additional Safety Information BOUT UIDE Introduction How to Use This Guide Conventions Year 2000 Compliance NTRODUCTION Introduction Applications Hardware Description Features 56K LAN M ODEM...
  • Page 8 56K LAN M ONFIGURING THE Understanding Dial-in Basics Understanding the Three Dial-in Profile Types Part I. Configuring the Server-side Dual 56K LAN Modem for Dial-in Support Part II. Configuring a Client Device for Dial-out Access Configuring Dial-in User Parameters ODEM...
  • Page 9 ROUBLESHOOTING AND Checking the Basics Monitoring LEDs Evaluating Symptoms and Solutions Finding More Information Contacting Technical Support Downloading Firmware to Your Dual 56K LAN Modem Resetting the Dual 56K LAN Modem Reviewing Statistics Synchronizing the LAN Modem Clock ETWORKING RIMER...
  • Page 10 LOSSARY ORPORATION IMITED IFETIME ARRANTY EGULATORY AND PROVAL NFORMATION...

  • Page 11: About This Guide

    Introduction This guide tells you how to install and configure the Dual 56K LAN Modem and provides descriptions of key applications and networking concepts. This guide is intended for end users with no presumed level of expertise.

  • Page 12: Conventions

    The OfficeConnect LAN Modem is Year 2000 compliant. Specifically, its system clock is capable of accepting and storing dates including and beyond the year 2000. For information on Year 2000 compliance and 3Com products, visit the 3Com Year 2000 web page: Notice Type Alerts you to...

  • Page 13: Introduction Introduction

    53 Kbps. Actual speeds may vary. Requires compatible analog phone line and server equipment. The Dual 56K LAN Modem complies with the V.90 ITU standard and is backwards-compatible with all US Robotics 56K standards. Standard officially determined in February, 1998;...

  • Page 14: Applications

    NTRODUCTION Applications The primary applications for the Dual 56K LAN Modem are: The following diagrams illustrate the primary Dual 56K LAN Modem applications: Local Networking with Users can share access to the Internet while they continue to network locally, as Shared Internet Access shown in Figure 1.
  • Page 15 Figure 4 Local Networking and Dial-out Access with Dial-in Support OfficeConnect Dual 56K LAN Modem MODEM 1 MODEM 2 LAN Status OfficeConnect Dual 56k LAN Modem Two analog POTS lines MODEM 1 MODEM 2 LAN Status OfficeConnect Dual 56k LAN Modem...

  • Page 16: Hardware Description

    HAPTER NTRODUCTION Hardware Description The following is an overview of the Dual 56K LAN Modem hardware, including the function of the front panel LEDs and back panel connectors. Front Panel LED The front panel contains the LEDs illustrated in Figure 5.
  • Page 17 The back panel contains the connectors illustrated in Figure 6. Description 10-30V DC Figure 6 Dual 56K LAN Modem Back Panel From left to right, the back panel consists of the following: Power: Connect the power module cable to this port.

  • Page 18: Features

    Domain Name Service (DNS) server functionality for the LAN, which translates the common, alphanumeric name of a device (for example, “www.3com.com”) to its numeric IP address 1.Current FCC rules limit download speeds to 53Kbps per modem. ® and 2000...
  • Page 19 LAN to share a single remote connection and user account. Intelligent NAT, an enhancement to NAT which enables UDP applications to work with the Dual 56K LAN Modem. Multiplexing traffic from several computers to remote destinations Bandwidth Management Automatic call initiation (also known as dial-on-demand routing) Automatic disconnection of idle calls after a specified length of time...
  • Page 20 Diagnostics LED status display Statistics display Warranty 3Com Corporation Limited Lifetime Warranty (refer to the end of this User Guide for details). Support for Internet Applications Support for applications that use the User Datagram Protocol (UDP) and the Transmission Control Protocol (TCP). The UDP protocol is used primarily by Internet games.

  • Page 21: Dual 56K Lan Modem

    For a basic understanding of modems and networking, refer to the Networking Primer in Appendix A. LAN Side Connectivity: On the Local Area Network (LAN) side of the Dual 56K LAN Modem, you can Installing an Ethernet connect up to four computers and/or printers directly to the unit’s built-in Ethernet hub.

  • Page 22: Wan Side: The Two 56K Modems

    56K LAN M HAPTER Wan Side: The Two On the Wide Area Network (WAN) side of the Dual 56K LAN Modem, up to 25 56K Modems users can share access to the WAN through use of the LAN Modem’s two internal 56K modems.
  • Page 23 Using the Modem Channels ¤ OfficeConnect Dual 56K LAN Modem Public telephone MODEM 1 MODEM 2 LAN Status network OfficeConnect Dual 56k LAN Modem Combining both analog lines with Multilink provides a single high-speed connection 1500 System CONSOLE STACKNET 3Com...
  • Page 24 Network ID of the Private Network, then the call is routed to the first configured ISP connection. IP Address Translation When the Dual 56K LAN Modem is configured for any type of dial-out access, by Using NAT default the IP address translation system, Network Address Translation (NAT), is used to enable IP address sharing among the attached workstations.

  • Page 25: Dial-In Functionality

    Figure 11. Small Office LAN Figure 11 Simultaneous Dial-in and Dial-out Connections Server MODEM 1 MODEM 2 LAN Status OfficeConnect Dual 56k LAN Modem ¤ OfficeConnect Dual 56K LAN Modem Dial-in Functionality Public telephone network Two analog lines...
  • Page 26 Multilink provides a single high-speed connection Small Office LAN MODEM 1 MODEM 2 LAN Status OfficeConnect Dual 56k LAN Modem ¤ OfficeConnect Dual 56K LAN Modem Two analog lines Small Office LAN MODEM 1 MODEM 2...

  • Page 27: Understanding Multilink Ppp And Other Line Usage Options

    Protocol (MLPPP) combined to form a single, high-bandwidth connection or channel. In the case of the Dual 56K LAN Modem’s two 56K lines, Multilink PPP is used to combine these two 56K connections into a virtual, single 112K connection. BACP/BAP...

  • Page 28: The Virtual Fax Modem (Windows 95, 98, Nt, And 2000)

    Channels” call and the location you are calling does not support this functionality, a connection may not be established at all. The Virtual FAX The Dual 56K LAN Modem can be used with the Virtual FAX Modem application Modem (Windows 95, (included on the OfficeConnect Dual 56K LAN Modem Companion Programs...

  • Page 29: Support For Virtual Private Networks (Vpns)

    Figure 14 VPN Tunnel Connection to a Remote Private Network via an ISP To create a VPN tunnel from a workstation attached to the Dual 56K LAN Modem, no special configuration of the LAN Modem is required. The client workstation must, however, have the appropriate software, and a tunnel server must be set up at the remote private network.
  • Page 30 2: D 56K LAN M HAPTER ODEM UNCTIONALITY ESCRIPTION...

  • Page 31: Before You Begin

    This chapter explains how to set up your Dual 56K LAN Modem, and guides you through the basic pre-installation checks that you should perform on all workstations that you will attach to the LAN Modem. This includes checking each workstations’ TCP/IP and IP address settings to determine whether it is set up for dynamic or static IP networking.

  • Page 32: Why Check Tcp/Ip And Ip Address Settings

    LAN Modem’s internal configuration screens. Why Check TCP/IP and The Dual 56K LAN Modem is an IP router designed for optimal use with networks IP Address Settings? that use dynamic IP addressing. For most people using the LAN Modem for shared Internet access, dynamic IP addressing is the type of addressing scheme most often used by Internet Service Providers (ISPs).
  • Page 33 Sets applications which previously used a Dial-Up Networking connection to use a LAN connection. (Optional) Configures a statically-configured PC to access the LAN Modem’s configuration screens, and, if you choose, changes the LAN Modem’s IP address to communicate with a statically-configured PC. If you prefer to follow the manual procedure for setting up TCP/IP, refer to “Setting Up Your Computer If You Have a Static IP Address”...

  • Page 34: Adding Tcp/Ip To Your Protocols List

    3: B HAPTER EFORE EGIN Adding TCP/IP to Your If you ran the EZ-LAN Wizard on your computer and found that TCP/IP was not Protocols List bound to your Ethernet adapter, follow the steps to add TCP/IP to your protocols list, according to your operating system: Windows 95 and 98 To add TCP/IP to your protocols list for Windows 95 or 98:...
  • Page 35 The Select Network Protocol dialog box appears. Figure 18 Select Network Protocol Dialog Box 4 From the Manufacturers list box, select Microsoft, and then from the Network Protocols list box, select TCP/IP. 5 Click OK to exit the Select Network Protocol Dialog box. 6 Click OK again to exit the Network Dialog box.
  • Page 36 3: B HAPTER EFORE EGIN 2 Select the Protocols tab, as shown in Figure 19. Figure 19 Windows NT Protocols Configuration Window 3 Click Add. The Select Network Protocol window appears as shown in Figure 20. Figure 20 Select Network Protocol Window 4 Select TCP/IP Protocol, and then click OK.
  • Page 37 The following message appears. Figure 21 DHCP Message Box 5 Select Yes, unless you know that you will be setting up the LAN Modem for use on a static network. By selecting Yes, you are setting up the LAN Modem to act as your DHCP server.
  • Page 38 Figure 23 Microsoft TCP/IP Properties Window 9 From the Adapter drop-down list box, select the Ethernet card that is connected to the Dual 56K LAN Modem. 10 Select Obtain an IP Address from a DHCP Server, unless you are setting up for static IP addressing.

  • Page 39: Setting Up Your Computer If You Have A Static Ip Address

    Setting Up Your If your computer has a static IP address and you want to keep this for use with a Computer If You Have network that uses or will use static IP addressing, you must make certain changes a Static IP Address to the LAN Modem’s default parameters.
  • Page 40 These instructions assume that the LAN Modem configuration is set to the factory default. If you are moving the LAN Modem from a different LAN, reset the LAN Modem before you begin. To do so, refer to “Resetting the Dual 56K LAN Modem,” Chapter 10.
  • Page 41 Your workstation has now been set up to temporarily access the LAN Modem’s initial configuration screens. You are ready to go on to Chapter 4, “Installing the Dual 56K LAN Modem.” Once installed, follow the steps in Chapter 5, “Typical Configuration”, and note the extra step for Static IP setup.
  • Page 42 Your workstation has now been set up to temporarily access the LAN Modem’s initial configuration screens. You are ready to go on to Chapter 4, “Installing the Dual 56K LAN Modem.” Once installed, follow the steps in Chapter 5, “Typical Configuration”, and note the extra step for Static IP setup.

  • Page 43: Nstalling The

    This chapter explains how to connect your computer to the Dual 56K LAN Modem and install the cables in preparation for configuring the unit. When you first set up the LAN Modem, you initially connect only one computer to the unit. After you have finished configuring the LAN Modem from that computer using a standard web browser, you can then begin to network additional computers, hubs, and/or printers to the LAN Modem.

  • Page 44: Dual 56K Lan Modem For Internet

    To install the analog devices: 4 Connect the analog device or devices to the ports labeled PHONE 1 and PHONE 2 on the back of the Dual 56K LAN Modem and to your analog equipment, as shown in Figure 27.
  • Page 45 Watch for the LAN Status LED to flash and then remain lit. MODEM 1 This completes the Dual 56K LAN Modem installation. You are ready to go on to Chapter 5 to configure the LAN Modem for shared access to the Internet. Or, if you wish to configure the LAN Modem for shared dial-out access to a Private...
  • Page 46 4: I 56K LAN M HAPTER NSTALLING THE ODEM...

  • Page 47: Typical Configuration

    This chapter explains how to configure the Dual 56K LAN Modem for the most common application — shared Internet access. If you followed the instructions provided in the Getting Started Guide, you have already configured the LAN Modem for shared Internet access. For more advanced applications, including connecting to a remote Private Network, configuring advanced parameters, or...
  • Page 48 In addition, you should have the following information ready as you go through the configuration: Configuration Steps The following steps guide you through configuration of the Dual 56K LAN Modem for shared Internet access. If you ran the computer pre-checks in Chapter 3 and found that your computer...
  • Page 49 The Set Password window appears. This password is used to guard access to the Dual 56K LAN Modem’s configuration program. If you would like to restrict access to the configuration settings, select a password and record it in a safe place.
  • Page 50 If you do not want to use the ISP Wizard, preferring instead to set up a connection to a Private Network, click Abort to reach the Dual 56K LAN Modem Main Configuration Page. Refer to Chapter 6, “Configuring the Dual 56K LAN Modem for Private Network Access, or Chapter 7, “Configuring Additional Service...
  • Page 51 WAN. A congratulations message appears. A successful connection to the Internet verifies the successful configuration of your Dual 56K LAN Modem and your ISP connection. If the connection to your ISP does not go through, refer to Chapter 10, “Troubleshooting and Maintenance.”...

  • Page 52: Changing The Lan Modem Ip Address For Static Ip Users

    ONFIGURING THE The LAN Modem Support Web Site From the LAN Modem Support web site, you can register your Dual 56K LAN Modem, read any new and up-to-date information about your product, and perform firmware upgrades to the LAN Modem as they become available.

  • Page 53: The Lan Modem Main Configuration Page

    Setting Up Additional Now that you have finished configuring your Dual 56K LAN Modem, you can set Service Provider Profiles up a total of four additional Service Provider profiles. The LAN Modem defines any remote dial-out destination (including the ISP profile you just configured) as a Service Provider.
  • Page 54 5: C HAPTER ONFIGURING THE Figure 34 Dual 56K LAN Modem Main Configuration Home Page Even though the Main Configuration Page and its associated links are viewed within your web browser, you are looking at screens which reside inside the LAN Modem firmware, rather than on the World Wide Web.
  • Page 55 Advanced: Brings up a secondary set of buttons, through which you can access the Local DNS Table, Upgrade Check, and Maintenance pages. From the Maintenance page, you can reset the Dual 56K LAN Modem and set it up for downloading the latest firmware.

  • Page 56: Connecting An External Hub To The Dual 56K Lan Modem

    Figure 35 10-User Shared WAN Connection Using an 8-Port Ethernet Hub Before You Begin To create a shared WAN connection for more than four users on the Dual 56K LAN Modem, you will need the following: If the hub you are using does not have an MDI/MDIX switch, you will have to use a crossover cable.
  • Page 57 Connecting an External Hub to the Dual 56K LAN Modem To connect the hub to the Dual 56K LAN Modem: 1 Insert one end of the Ethernet cable into any available LAN port on the back of the LAN Modem, as shown in Figure 36.
  • Page 58 5: C 56K LAN M HAPTER ONFIGURING THE ODEM FOR NTERNET CCESS...

  • Page 59: Configuring The Dual 56K Lan Modem For Private Network Access

    This chapter explains how to configure the Dual 56K LAN Modem for shared access to a private network, such as a remote corporate office LAN. This includes the option of connecting to the Internet through your private network, if your private network allows you this option.

  • Page 60: Configuration Steps

    HAPTER ONFIGURING THE Configuration Steps The following steps guide you through configuration of the Dual 56K LAN Modem for shared access to a remote private network. If you ran the computer pre-checks in Chapter 3 and found that your computer was set up for static IP addressing, refer to the section “Changing the LAN...
  • Page 61 Figure 38 Set Password Window 3 (Optional) Enter a Password in the Password field, and enter it again in the Password (repeat) field to confirm it. If do not wish to enter a Password, leave the fields empty. 4 Click Submit. A message box indicates that your password has been set.
  • Page 62 Configuration Page, also called the WebWizard. The LAN Modem homepage opens, as shown in Figure 40. Figure 40 Dual 56K LAN Modem Main Configuration Home Page 8 From the Main Configuration Home Page, click the Service Providers icon. The Service Provider Selection window appears, as shown in Figure 41.
  • Page 63 Configuration Steps Figure 41 Service Provider Selection Window 9 Select New (Private Network) from the drop-down list box, and click Select.
  • Page 64 6: C HAPTER ONFIGURING THE The Private Network Parameters window appears, as shown in Figure 42. Figure 42 Private Network Parameters Window 10 In the Name field, enter a name for this remote destination, such as the location of the remote office. 11 In the Dial Out Prefix field, enter the number required by your location to reach an outside line, if necessary.
  • Page 65 dial out prefix, leave the Dial Out Prefix field blank and enter that prefix value as part of the individual telephone number field itself (for example, ‘918005551000’). 13 In the Telephone Number 1 field, enter the telephone number that you obtained from your Network Administrator for accessing this private network.
  • Page 66 6: C HAPTER ONFIGURING THE 21 Choose whether or not you want users on the LAN to be able to access the Internet through your private network’s direct Internet connection, if your private network allows you this option 22 Choose whether or not you would like to use PPP Data Compression when transferring data.

  • Page 67: Changing The Lan Modem Ip Address For Static Ip Users

    If a connection script is necessary, refer to Chapter 7, “Using a Connection Script,” for assistance. If you chose to password-protect the configuration profile of the Dual 56K LAN Modem and would like to lock and/or change the configuration, refer to Chapter 7, “Locking and Unlocking the Configuration.”...

  • Page 68: The Lan Modem Main Configuration Page

    — for example, adding additional Service Providers, configuring advanced parameters, or changing current parameters — can be handled through the Dual 56K LAN Modem’s Main Configuration Page. Figure 43 Dual 56K LAN Modem Main Configuration Page The Main Configuration Page provides links to configuration, dialing, and statistics...
  • Page 69 Advanced: Brings up a secondary set of buttons, through which you can access the Local DNS Table, Upgrade Check, and Maintenance pages. From the Maintenance page, you can reset the Dual 56K LAN Modem and set it up for download of the latest firmware.

  • Page 70: The Lan Modem Support Web Site

    Support Web Site your private network, you may wish to visit the LAN Modem Support web site, where you can register your Dual 56K LAN Modem, read any new and up-to-date information about your product, and perform firmware upgrades to the LAN Modem as they become available.

  • Page 71: Advanced Configuration

    Advanced This section covers the following topics: Configuration Configuring Once you have configured at least one service provider in the Dual 56K LAN Additional Service Modem, you can add service providers for Internet and/or private network access. Providers You can configure up to a total of four service provider profiles, including any that you have already created through the initial setup.
  • Page 72 Configuration Steps To configure an additional Internet Service Provider profile, follow these steps: 1 From the Dual 56K LAN Modem ‘s Main Configuration Home Page, click the Service Providers icon. The Service Provider Selection window appears, as shown in...
  • Page 73 The Internet Service Provider Parameters window appears. Figure 45 ISP Parameters Window 3 In the Name field, choose any name that you wish to associate with this ISP. 4 In the Dial Out Prefix field, if applicable, enter the number required by your location to reach an outside line, if necessary.
  • Page 74 7: A HAPTER DVANCED ONFIGURATION 6 In the Telephone Number 1 field, enter the telephone number you must dial in order to reach your ISP. 7 (Optional) If your ISP has a second remote access number, enter it in the designated field, and select Alternate or Multilink from the drop-down list (that is, choose whether you want to dial this second number as an alternate number when the first is unavailable, or whether you want to dial this number in addition to the first to create a...
  • Page 75 If your service provider requires that you create a connection script, refer to “Using a Connection Script”. If you wish to password-protect the configuration profile of the Dual 56K LAN Modem, refer to “Locking and Unlocking the Configuration.” Configuring Additional Service Providers...

  • Page 76: Editing Service Provider Profiles

    Service Providers providers, refer to the instructions under “Associating Service Providers with Workstations on the LAN.” If you wish to password protect the configuration profile of the Dual 56K LAN Modem, refer to “Locking and Unlocking the Configuration.” Associating Service When you configure a Service Provider on the Dual 56K LAN Modem, by default...

  • Page 77: Using A Connection Script

    The call will go to the first ISP checked. Click Submit to save your changes. If you wish to password protect the configuration profile of the Dual 56K LAN Modem, refer to “Locking and Unlocking the Configuration.”...
  • Page 78 7: A HAPTER DVANCED ONFIGURATION Figure 46 Script Configuration Page Creating a Connection You can create a script from any other text editor of your choice and copy and Script paste the script directly into the Script Configuration text box. Or you may use the buttons located along the left side of the script window to guide you through the scripting process.
  • Page 79 Using the Configuration To create a connection script using the configuration buttons, do the following. Buttons 1 From the Script Configuration page, click Begin. The text begin is entered as the first line in the script window. 2 Click Delay to set a delay interval before executing the next line of the script. The Delay dialog box opens.
  • Page 80 7: A HAPTER DVANCED ONFIGURATION Add any additional Transmit or WaitFor text as required. Note that a carriage return is simulated by including text. For example: carriage return. 12 Click End when your script is complete. The last line of text in your script must conclude with end An example of a completed script is shown in Figure 47.

  • Page 81: Configuring Lan Parameters

    Parameters Name Displays the name for the Dual 56K LAN Modem. This name is used for DNS (Domain Name System) resolution and cannot be changed. In the example shown in Figure 48, the name LANmodem is translated to the IP address 192.168.1.1.
  • Page 82 7: A HAPTER DVANCED ONFIGURATION reconfigure the workstations’ IP addresses via the Workstations Parameters window. For a LAN using dynamic IP addresses, restart your workstation to acquire a new IP address. Or, if you have Windows 95 or 98, launch winipcfg.exe (probably located in your Windows directory), and click Release All and then Renew All.

  • Page 83: Configuring V.90 Modem Control Parameters

    5 Check the Enable DHCP server box to enable it or clear the box to disable it. WARNING: If you change the IP address and/or the subnet mask of your Dual 56K LAN Modem, the Dual 56K LAN Modem will re-initialize itself when you submit the changes by clicking Submit.
  • Page 84 7: A HAPTER DVANCED ONFIGURATION Changing Modem To access and make changes to the Modem Control parameters, do the following. Controls 1 From the Main Configuration Page, click the Service Providers icon. 2 Choose the service provider whose associated modem parameters you want to change, and click Select.

  • Page 85: Changing Data Call Parameters

    6 Click Submit to save your changes. Note that each service provider (up to four) has its own associated Modem Settings profile. Changes made to one service provider will affect only that particular service provider. Changing Data Call This section explains how to configure Data Call Parameter settings. The data call Parameters parameters consist of Timeout Values for both automatic and manual calls, as well as Bandwidth on Demand Parameters for Multilink calls.
  • Page 86 Companion Programs CD ROM or it may be downloaded from the LAN Modem Web site: http://www.3com.com/support/docs/lanmodem/util.html Redial Attempts for a Manual Call. This field designates the number of times the LAN Modem will redial a call that is placed using the Manual Call Control screen.

  • Page 87: Specifying A Wins Server Address

    Configuring the Data To configure data call parameters, follow these steps: Call Parameters 1 From the Dual 56K LAN Modem Main Configuration Page, click the Clock icon. 2 Specify the Data Call Parameters. 3 Click Submit. If you wish to password-protect the configuration profile of the Dual 56K LAN Modem, refer to “Locking and Unlocking the Configuration.”...

  • Page 88: Configuring The Local Dns Table

    ONFIGURATION 4 Click Submit. Configuring the Local The Dual 56K LAN Modem includes a local DNS Table for configuring up to ten DNS Table static DNS entries. This allows the LAN Modem to resolve designated IP addresses locally. The Local DNS Table can be used to suppress spurious calls which can occur when an application on the LAN generates packets which in turn launch an unwanted call to your service provider.

  • Page 89: Reserving Dhcp Addresses

    If you want to password protect the configuration profile of the ISDN LAN Modem, refer to Changing Your A password allows you to restrict access to the Dual 56K LAN Modem’s Password configuration screens. To change the password which was defined as part of the initial setup, or to set a password for the first time, do the following:...

  • Page 90: Locking And Unlocking The Configuration

    Home Page again. What If I Forget My If you forget your password, you must reset the Dual 56K LAN Modem to the Password? factory default settings, which will allow you to enter a new password. Note that when the Dual 56K LAN Modem is restored to the factory default settings, all configuration changes are lost, including your service provider profiles.

  • Page 91: Using Selective Password Protection

    Chapter 9, “Placing a Call Manually.” Configuring the LAN This section provides instructions for dialing in to the Dual 56K LAN Modem from Modem from a a remote location, using either a modem or another analog LAN Modem, in order Remote Location to make configuration changes.
  • Page 92 For instance, one LAN Modem can be on the 192.168.1.x subnetwork, and the other one can be on the 192.168.2.x subnetwork. 2 In the local LAN Modem (from which you are accessing the remote Dual 56K LAN Modem), create a Private Network Service Provider profile for the remote Dual 56K LAN Modem.
  • Page 93 17 Double-click your new connection icon created via Dial-Up Networking. The Connect To window will open. 18 Enter the Remote Administration Username and Password that was assigned to the Dual 56K LAN Modem. By default, the Username is Admin, and the Password is 1234. 19 Click Connect.

  • Page 94: Checking For Dual 56K Lan Modem Upgrades

    Refer to Chapter 8, “Configuring the Dual 56K LAN Modem for Dial-in Support” for assistance. Checking for Dual 56K The Dual 56K LAN Modem has an Upgrade Check feature which will query the LAN Modem upgrades LAN Modem’s Internet homepage for available firmware updates.

  • Page 95: Onfiguring The Dual 56K Lan Modem For Dial - In Support

    The Dual 56K LAN Modem can only accept dial-in calls from another analog device, such as an analog modem, a 56K LAN Modem or Dual 56K LAN Modem, or another analog router. It cannot accept dial-in calls from an ISDN terminal adapter or an ISDN LAN Modem.

  • Page 96: Understanding The Three Dial-In Profile Types

    Figures 53 and 54 illustrate the two possible Single User Dial-in profile type scenarios. 56K LAN M ODEM FOR UPPORT 192.168.1.2 192.168.1.3 MODEM 1 MODEM 2 LAN Status OfficeConnect Dual 56k LAN Modem OfficeConnect Dual 56K LAN Modem 192.168.1.4 LAN Modem issues single IP address to 192.168.1.5 Server-side LAN 192.168.254.1 192.168.254.1...
  • Page 97 LAN by domain name, as well as IP address. Understanding the Three Dial-in Profile Types 192.168.254.1 MODEM 1 MODEM 2 LAN Status OfficeConnect Dual 56k LAN Modem OfficeConnect Dual 56K LAN Modem Server-side LAN Modem issues single IP address to client-side LAN Modem Server-side LAN 192.168.254.1...
  • Page 98 The Advanced Dial-in profile applies to a network scenario in which a router other than a LAN Modem will be dialing into the Dual 56K LAN Modem. Advanced Dial-in assumes that both the Dual 56K LAN Modem and the other router have been manually configured for static IP addressing, and each employs a...

  • Page 99: Part I. Configuring The Server-Side Dual 56K Lan Modem For Dial-In Support

    The Remote Administration account is a restricted version of a Dial-in User Profile Administration which allows for limited dial-in access to the Dual 56K LAN Modem for remote Username and Password configuration purposes only. By default, a Remote Administration account is already set up in the LAN Modem, with the following defaults: Before you configure the Dual 56K LAN Modem for full dial-in access, it is...
  • Page 100 These include designating a Callback prefix, setting a Site Number for LAN-to-LAN dial-in, configuring Auto Answer, and setting authentication preferences. To configure Dial-in Global Parameters in the server-side Dual 56K LAN Modem, follow these steps: 1 From the LAN Modem Main Configuration page, click the Dial-In button.
  • Page 101 Part I. Configuring the Server-side Dual 56K LAN Modem for Dial-in Support 5 If you are planning to use the Callback feature, use the Callback Prefix field to enter the number required to reach an outside line, such as a 9. Otherwise, leave this field blank.
  • Page 102 8: C HAPTER ONFIGURING THE Once the LAN Modem has changed its IP address, you will no longer be able to access the configuration screens through your Web browser until you re-start your workstation and allow it to acquire a new IP address from the LAN Modem’s new subnet.
  • Page 103 Part I. Configuring the Server-side Dual 56K LAN Modem for Dial-in Support The Dial-In Wizard Profile Type Selection window appears, as shown in Figure 58. Figure 58 Dial-In Wizard Profile Type Selection Window 3 Select Single User from the drop-down list, and then click Next.
  • Page 104 8: C HAPTER ONFIGURING THE The Dial-In Wizard Password window appears, as shown in Figure 59. Figure 59 Dial-In Wizard Password Window 4 Enter a unique Username and Password which the dial-in user must enter when calling in to this LAN Modem. This information will be entered in the Username and Password fields when you configure your client device.
  • Page 105 1 From the LAN Modem Main Configuration Page, click the Dial-In button. 2 Click the Dial-In Wizard button. The Dial-In Wizard Profile Type Selection window appears, as shown in Figure 61. Part I. Configuring the Server-side Dual 56K LAN Modem for Dial-in Support...
  • Page 106 8: C HAPTER ONFIGURING THE Figure 61 Dial-In Wizard Profile Type Selection Window 3 Select LAN Modem Site-to-Site from the drop-down list, and then click Next. The Dial-In Wizard Password window appears, as shown in Figure 62. Figure 62 Dial-In Wizard Password Window 4 Enter a unique Username and Password for the second site LAN Modem.
  • Page 107 Part I. Configuring the Server-side Dual 56K LAN Modem for Dial-in Support This information will be entered in the Username and Password fields when you configure a Private Network Service Provider profile in the second site LAN Modem. 5 Click Next.
  • Page 108 8: C HAPTER ONFIGURING THE Figure 64 Dial-In Wizard Internet Service Provider Window 8 Select an Internet Service Provider for this dial-in user to use when accessing the Internet from the remote location. 9 Click Finish. This completes the server-side portion of the configuration for LAN Modem Site-to-Site Dial-in.

  • Page 109: Part Ii. Configuring A Client Device For Dial-Out Access

    Dial-Up Networking if you are a Windows user—to create a remote Calling connection to the server-side Dual 56K LAN Modem. For the basic steps for creating a dial-out modem connection using Dial-Up Networking, you can refer to the section, “Configuring the LAN Modem Remotely via an Analog Modem,”in Chapter 7 of this User Guide.
  • Page 110 Changed the LAN Modem’s IP address, as described below (this prevents a possible IP address conflict with the server-side LAN Modem). Configured the unit as a server-side LAN Modem, as described in “Part I. Configuring the Server-side Dual 56K LAN Modem for Dial-in Support,” page 99.
  • Page 111 configuration first will ensure that the LAN Modem occupies a subnet different from the LAN Modem into which it will be dialing. To create a Private Network Service Provider profile for dial-out access, have the Creating a Private Network Service Provider Profile following information ready:* In addition, if you want to use the Callback feature, have the following ready: * If this is the first (Site A) LAN Modem in a LAN Site-to-Site setup, and if you have not yet...
  • Page 112 8: C HAPTER ONFIGURING THE Figure 66 Private Network Parameters Window 3 In the Name field, enter a name for this Service Provider, such as the location of the server-side LAN Modem. 4 In the Dial Out Prefix field, if applicable, enter the number required by your location to reach an outside line, if necessary.
  • Page 113 Part II. Configuring a Client Device for Dial-out Access 6 In the Alternate drop-down list box, you can select Alternate and enter the second LAN Modem telephone number, to be dialed if the first number is unavailable. Or, if the server LAN Modem was set up to allow Multilink dial-in calls, select Multilink and enter the second telephone number.

  • Page 114: Configuring Dial-In User Parameters

    8: C HAPTER ONFIGURING THE 14 For Network Address Translation, your choice depends on the Dial-User Profile Type that you selected for this LAN Modem, as follows: 15 Under WAN Link IP address, leave these fields blank. The LAN Modem will automatically assign these values upon connection.
  • Page 115 Configuring Dial-in User Parameters Figure 67 Dial-in User Selection Screen 2 Choose either New Dial-in User to create a new profile, or choose an existing Dial-in User from the drop-down list, and click Select. The Dial-in User Parameters screen opens, as shown in Figure 68.
  • Page 116 8: C HAPTER ONFIGURING THE Figure 68 Dial-in Users Parameters Screen 3 In the Name field, enter a unique name to designate this dial-in user. 4 In the Password field, enter a password to verify access when this user dials into the LAN Modem.
  • Page 117 7 In the ISP Selection field, select the service providers that this dial-in user can access. 8 In the Data Compression field, choose to have data compression active or inactive. By default compression is disabled. (In order for compression to occur, the other end of the connection must also have compression active.) Callback Parameters This section allows you to enable and configure callback functionality.

  • Page 118: Placing A Call From A Client-Side Lan Modem

    Private Network as your service provider, and not an ISP. Once connected, you can use all LAN resources available on the server end of the connection. For further information, visit the LAN Modem’s Internet Homepage at http://www.3com.com/support/docs/lanmodem. 56K LAN M ODEM FOR...

  • Page 119: Placing , Receiving And Disconnecting Calls

    The LAN Modem Desktop Manager is included on the OfficeConnect Dual 56K LAN Modem Companion Programs CD-ROM. Once installed, the application resides in the Windows Tool Tray. No configuration of the Dual 56K LAN Modem is necessary. In addition to the CD-ROM, the application may be downloaded directly from the LAN Modem Utilities website: http://www.3com.com/support/docs/lanmodem/util.html...
  • Page 120 To place a manual call to a configured service provider, do the following. 1 From the Dual 56K LAN Modem home page, click the Manual Calling button. The Manual Call Control window appears.

  • Page 121: Receiving Calls

    The Dual 56K LAN Modem can receive both voice and data calls, as follows: Receiving Voice Calls Voice calls received by the Dual 56K LAN Modem will be routed by default to any analog equipment connected to one of the PHONE ports, assuming that a data call is not currently connected.

  • Page 122: Disconnecting Calls

    ISCONNECTING ALLS Downloading the latest firmware. Refer to Chapter 10, “Downloading Firmware to Your Dual 56K LAN Modem,” for instructions. Reviewing Dual 56K LAN Modem statistics Refer to Chapter 10, “Reviewing Statistics,” for instructions.
  • Page 123 Timers Minimum Call Duration Enter the minimum length of a call that must be reached before the Dual 56K LAN Modem detects inactivity on the connection and then starts an inactivity timer. The default is 120 seconds (two minutes), which is also the lowest value allowed for this field.
  • Page 124 9: P HAPTER LACING ECEIVING AND ISCONNECTING ALLS...

  • Page 125: Troubleshooting And Maintenance

    This chapter explains how to isolate and solve problems encountered with the Dual 56K LAN Modem, such as problems caused by incorrect settings or improper installation. Basic maintenance information for the Dual 56K LAN Modem is also provided. The following main topics are covered in this chapter: CAUTION: There are no user-serviceable parts inside your Dual 56K LAN Modem.

  • Page 126: Evaluating Symptoms And Solutions

    HAPTER ROUBLESHOOTING AND Monitoring the Alert Power cycle the Dual 56K LAN Modem and observe the Alert LED. During the power-up self-test, the Alert LED will remain lit. Monitoring the LAN Observe the LAN Status LEDs labeled 1, 2, 3, or 4, depending on the port to which Status LEDs a workstation is attached.
  • Page 127 Your Web browser may be configured to use a proxy server. There is a configuration problem. Reset the Dual 56K LAN Modem to the factory default The wrong cable may be connected to the LAN port on the Dual 56K LAN Modem and your computer.
  • Page 128 Notify your reseller or technical support that the Dual 56K LAN Modem has failed the self-test. Power-cycle the Dual 56K LAN Modem. If the Alert LED continues to flash, the LAN Modem has failed the self-test. Contact your network supplier. If the Alert LED is no longer flashing, then the LAN Modem is now operating correctly.
  • Page 129 Enable NetBIOS filtering. Refer to Chapter 7, “NetBIOS Filtering” for more information: Make sure that the Dual 56K LAN Modem’s data call timeout value is not set to 0. Check the timeout values configured for the LAN Modem, as explained in “Changing Data Call Parameters,”...
  • Page 130 10: T HAPTER ROUBLESHOOTING AND Table 6 Symptoms, Causes, and Solutions Symptom Possible Cause (continued) LAN Modem is not answering Auto Answer is set to Disable. Dial-in data calls Browser is not displaying newly Web browser may be caching entered information. older pages.

  • Page 131: Finding More Information

    Finding More For more information about the Dual 56K LAN Modem, such as Frequently Asked Information Questions and specific technical notes, go to the following URL, http://www.3com.com/support/docs/lanmodem and easy access. Contacting Technical Contact your Network Supplier or refer to the technical support card that was Support included with your LAN Modem to find the technical support telephone number...

  • Page 132: Reviewing Statistics

    Product ID Serial Number Ethernet Address System software version number Boot software version number The LAN Modem has been up for Displays the length of time the Dual 56K LAN Modem has Date (Month/Day/Year) Time (Hour:Minute:Second) Modem 1 Modem 2 * This date and time is based on the computer initially used to set up the LAN Modem.
  • Page 133 Understanding Current The current call statistics are described in Table 8. Call Information Table 8 Current Call Statistics Description Current Call Information Connect Message Call direction Service provider name IP address in use Primary DNS address Secondary DNS address Data call options Call start time The call has been up for (minutes, seconds)

  • Page 134: Synchronizing The Lan Modem Clock

    Indicates the total number of octets (bytes) received by the Dual 56K LAN Modem. Indicates the total number of octets (bytes) transmitted by the Dual 56K LAN Modem. Indicates the collective connection time for this particular service provider...
  • Page 135 the LAN Modem. You can manually synchronize this internal clock to match the date and time of another attached workstation. To update the LAN Modem’s Real Time clock: 1 From the LAN Modem Main Configuration Page, click the Advanced button. 2 Click the Maintenance button.
  • Page 136 10: T HAPTER ROUBLESHOOTING AND AINTENANCE...

  • Page 137: Networking Primer

    ETWORKING RIMER This chapter provides a description of basic networking concepts and modem terminology to help you better understand the key functionality of the Dual 56K LAN Modem. What is a network? A network is a set of computers and other devices, such as printers, servers, hubs, and modems, that are connected together either directly through cabling, or indirectly through dial-up telephone or other services.
  • Page 138 LAN (typically, Ethernet). Thus, for example, the Dual 56K LAN Modem has Ethernet ports which serves as its link to the LAN on one side, and analog modem ports which serve as its link to the analog telephone network on the other.
  • Page 139 What is a network? What is a POTS POTS stands for “Plain Old Telephone Service” and refers to a basic, analog connection? telephone connection without any added features or functions. A POTS line is used to connect analog devices, such as a telephone, fax machine, or your Dual 56K LAN Modem, to the public telephone network.
  • Page 140 A: N PPENDIX ETWORKING RIMER What is an IP Address? An IP address is a numeric value of a set form—32 bits, or binary digits of either one or zero—which is used within a TCP/IP network to uniquely identify the location of every device within the network for purposes of routing data.
  • Page 141 reserved for other purposes). By contrast, a Class A network’s IP address allocates eight bits for the network number and 24 bits for the local address, allowing for a possible combination of 16,777,214 (2 To return to the postal analogy, just as a street address refers to the set location or residence itself and not to the occupant, who may change over time, an IP address refers to a device’s location and not the device itself.
  • Page 142 A: N PPENDIX ETWORKING RIMER A private organization’s internal router uses this new breakdown of (longer) network number and (shorter) host number to route data to subdivided areas, or subnets, within the broader “network” (as identified by the original network number).
  • Page 143 IP address. For example, www.3com.com is translated to an specific IP address by DNS. If you do not use the DHCP functionality of the Dual 56K LAN Modem, you will have to manually configure the following parameters for each computer on the LAN: IP address, subnet mask, DNS address and default gateway.
  • Page 144 However, the connection from your home to the CO will likely remain analog for some years to come. V.90 technology takes advantage of the typical network configuration found when an analog modem (such as your Dual 56K LAN Modem) accesses a digitally...
  • Page 145 Possible Limitations Note that several factors may affect your Dual 56K LAN Modem’s performance. Current FCC rules limit download speeds to 53 Kbps. Poor line conditions or heavy traffic may impact performance, just as with older V.34 modems. In real applications, speeds typically range from the 40s to the low 50s (Kbps), with the average in the mid-to upper 40s.There are cases where performance is in the 30s,...
  • Page 146 A: N PPENDIX ETWORKING RIMER...

  • Page 147: Nstalling And

    Installing the Virtual Fax To install the Virtual Fax Modem application, follow these steps: Modem Application 1 From the OfficeConnect Dual 56K LAN Modem Companion Programs CD-ROM, double-click the Virtual Fax Modem application. 2 Follow the on-screen instructions to install the application.
  • Page 148 3 Click Don't detect my modem; I will select it from a list, and then click Next. 4 Select 3Com Corp from the Manufacturer’s list on the left. 5 Select OC Dual 56K LAN Fax Modem from the Models list on the right and click Next.
  • Page 149 Configuring the LAN Once you have installed the Virtual Fax Modem application and the LAN Modem Modem for use with the COM port driver, you can further define the manner in which the Virtual Fax Virtual Fax Modem Modem interacts with the LAN Modem. This is done via the Virtual Fax Modem Parameters page.
  • Page 150 Modem. Make sure that any fax application you use is set for Class 2.0 (note that Class 2 and Class 2.0 are not the same). An example of a fax application that supports Class 2.0 fax communications is provided on the 3Com Companion Programs CD-ROM, or downloaded directly from the LAN Modem Utilities Web site: http://www.3com.com/support/docslanmodem.

  • Page 151: Creating A Virtual Private Network (Vpn) Tunnel

    This appendix tells you how to create a VPN tunnel from a client workstation, using the appropriate client software. Creating a Virtual The Dual 56K LAN Modem’s support of the PPTP protocol allows you to establish a Private Network (VPN) Virtual Private Network tunnel between a workstation attached to the LAN Tunnel Modem and a remote private network LAN.
  • Page 152 C: C PPENDIX REATING A IRTUAL Initiating the VPN Once the PPTP tunnel server has been set up at the private network and all client Tunnel workstations that will use a VPN tunnel have been set up with client software, each user simply initiates a tunnel from his or her workstation.

  • Page 153: Factory Defaults

    This appendix lists the factory default settings of the Dual 56K LAN Modem. Dual 56K LAN Modem Refer to Table 12 for the Dual 56K LAN Modem factory defaults. Factory Defaults Table 12 ACTORY EFAULTS Dual 56K LAN Modem Factory Defaults...
  • Page 154 D: F PPENDIX ACTORY EFAULTS...

  • Page 155: Specifications

    Refer to Table 13 for the Dual 56K LAN Modem specifications. Table 13 * You must use the power supply provided with your Dual 56K LAN Modem. Year 2000 Compliance The OfficeConnect LAN Modem is Year 2000 compliant. Specifically, its system clock is capable of accepting and storing dates including and beyond the year 2000.
  • Page 156 E: S PPENDIX PECIFICATIONS...
  • Page 157 LOSSARY analog signals A variety of signals and wavelengths that can be transmitted over communications lines. An example is a voice call over the phone line. BACP/BAP Bandwidth Allocation Control Protocol (BACP) and Bandwidth Allocation Protocol (BAP) are used in conjunction with the Multilink PPP feature. When Multilink PPP is negotiated, the BACP negotiates with the peer equipment to determine whether the peer supports BAP.
  • Page 158 Various techniques that check the reliability of characters or blocks of data. firmware Firmware is the code which resides in your Dual 56K LAN Modem and controls its behavior. It differs from software in the form of programs that run on your computer.
  • Page 159 LAN and WAN. Service Provider As used by the Dual 56K LAN Modem, the term Service Provider applies to any remote dial-out destination. The LAN Modem recognizes two categories of Service Providers: Internet Service Providers (see also ISP), which provide a direct connection to the Internet, and Private Network Service Providers, which provide a direct connection to a remote Private Network, such as a corporate office LAN.
  • Page 160 LOSSARY V.34 An ITU standard that currently allows data rates as high as 28,800 bps. V.34+ An enhancement to V.34 that enables transfer rates as high as 33, 600 bps. V.90 V.90 is the ITU standard which allows modems to receive data at up to 56Kbps over the standard, public switched telephone network (PSTN).
  • Page 161 If it appears that any product that is stated to meet this standard does not perform properly with regard to such date data on and after January 1, 2000, and Customer notifies 3Com before the later of April 1, 2000, or ninety (90) days after purchase of the product from 3Com or its authorized reseller, 3Com shall,...
  • Page 162 (48) hours of installation but no later than thirty (30) days after the date of purchase, and this is verified by 3Com, it will be considered dead- or defective-on-arrival (DOA) and a replacement shall be provided by advance replacement. The replacement product will normally be shipped not later than three (3) business days after 3Com’s verification of the DOA...
  • Page 163 EGULATORY AND PROVAL UROPEAN NION IC (I NDUSTRY ANADA ANADIAN NSTALLATIONS EALAND NFORMATION This device complies with the requirements of European Directive 1995/5/EC. Equipment Jack: CA-11A This digital apparatus does not exceed the Class B limits for radio noise emissions from digital apparatus set out in the radio interference regulations of Industry Canada (formerly the Canadian Department of Communications).
  • Page 164 This booklet is available from the U.S. Government Printing Office, Washington, D.C. 20402. Stock No. 004-000-00345-4. NOTE: In order to maintain compliance with the limits of a Class B digital device, 3Com requires that you use quality interface cables when connecting to this device. Changes or modifications not expressly approved by 3Com could void the user’s authority to operate this equipment.
  • Page 165 Support insert for repair information and the warranty section of this User Guide for warranty information. In the event of device malfunction, all repairs should be performed by 3Com or an authorized agent. It is the responsibility of users requiring service to report the need for service to our company or to one of our authorized agents.
  • Page 167 Advanced Dial-in explained 98 Alert LED 126, 128 analog equipment installation 44 Auto Answer configuring 101 back panel description 17 BACP/BAP defined 27 call routing among service providers 120 Callback explained 23 CD LED 129 Challenge Handshake Authentication Protocol (CHAP) 19 changing data call parameters 85 your password 71, 89, 91...
  • Page 168 Virtual Fax Modem explained 28 virtual fax modem configuring LAN Modem 149 installing 147 installing COM Port driver 148 terminating calls 150 virtual private network using with Windows 152 virtual private network (VPN) creating 151 virtual private networks explained 29 warranty 20, 161 Web site LAN Modem Support 52...

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